fn8968 rev.0.00 page 1 of 2 oct 5, 2017 fn8968 rev.0.00 oct 5, 2017 ISL95857C 1+2+1 voltage regulator with expanded iccmax register range sup porting intel imvp8 cfl/cnl cpus data short the ISL95857C provides a complete power solution for intel microprocessors suppor ting core, graphics, and system agent rails and is co mpliant with intel imvp8. the controller provides cont rol and protection for three voltage regulator (vr) outputs. the vr a and vr c outputs support 1-phase operation only, while vr b is configurable for 2- or 1- phase operation. the address options programmable for th ese three outputs allow for maximum flexibility in support of the imvp8 cpu. all three vrs share a comm on serial control bus to communicate with the cpu and achieve lower cost and smaller board area compared with a two-chip approach. based on intersils robust ripple regulator (r3?) technology, the r3 modulator has many advantages compared to traditional modul ators. these include faster transient settling time, variable switching frequency in response to load transients, and improved light-load efficiency due to diode emulation (de) mode with load-dependent low switching frequency. the controller provides pwm outputs, which support intel drmos power stages (or similar) and discrete power stages using the inte rsil isl95808 high voltage synchronous rectified bu ck mosfet driver. the controller complies with imvp8 ps4 power requirements and supports c ompatible power stages and drivers. the ISL95857C supports the system input power monitor (psys) option. the c ontroller supports either dcr current sensing with a s ingle ntc ther mistor for dcr temperature compensa tion, or more precision through resistor current sensing if desired. all three outputs feature remote voltage sense, programmable i max , adjustable switching frequency, oc protection, and a single vr_ready power-good indicator. features ? supports the intel se rial data bus interface ? fully supports ps4 power domain entry/exit ? supports system input power monitor (psys) ? three output controller ? vr a supports 1-phase vr design ? vr b configurable for 2 - or 1-phase vr design ? vr c supports 1-phase vr design ? 0.5% system accuracy over temperature ? low supply current in ps4 state ? supports multiple current sensing methods ? lossless inductor dcr current sensing ? precision resistor current sensing ? differential remote voltage sensing ? programmable svid address ? resistor programmable address selection, i max , and switching frequency applications ? imvp8 cfl and cnl compliant notebooks, desktops, ultrabooks, and tablets related literature ? for a full list of related documents, visit our website ? ISL95857C product page figure 1. v core /vr a load line = 2.4m figure 2. vgt/vr b load line = 2m figure 3. vsa/vr c load line = 10.3m 0.84 0.85 0.86 0.87 0.88 0.89 0.90 0.91 0 5 10 15 20 25 v in = 12v v in = 6v v in = 21v 0.82 0.83 0.84 0.85 0.86 0.87 0.88 0.89 0.90 0.91 0 5 10 15 20 25 30 35 40 v in = 12v v in = 6v v in = 21v 0.84 0.85 0.86 0.87 0.88 0.89 0.90 0.91 0123456 v in = 12v v in = 6v v in = 21v to request the full datasheet, please visit www.intersil.com/products/ISL95857C
fn8968 rev.0.00 page 2 of 2 oct 5, 2017 ISL95857C intersil products are manufactured, assembled and tested utilizing iso9001 quality systems as noted in the quality certifications found at www.intersil.com/en/support/qualandreliability.html intersil products are sold by description on ly. intersil may modify the circuit design an d/or specifications of products at any time without notice, provided that such modification does not, in intersil's sole judgment, affect the form , fit or function of the product. accordi ngly, the reader is cautioned to verify that datasheets are current befo re placing orders. information furnished by intersil is beli eved to be accurate and r eliable. however, no responsibility is assumed by intersil or its subsidiaries for it s use; nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent righ ts of intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com for additional products, see www.intersil.com/en/products.html ? copyright intersil americas llc 2017. all rights reserved. all trademarks and registered trademarks are the property of their respective owners.
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